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Finding the Fourth Proportional to 34.70, 47.89 and 20.15

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Solution

The fourth proportional to 34.70, 47.89 and 20.15 is: 27.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    34.70 : 47.89 = 20.15 : x
  2. Step 2: Convert to fraction form
    34.70/47.89 = 20.15/x
  3. Step 3: Cross multiply
    34.70x = 47.89 × 20.15
  4. Step 4: Simplify right side
    34.70x = 965.15
  5. Step 5: Solve for x
    x = 965.15/34.70
  6. Step 6: Final answer
    x = 27.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.